High luminous flux warm white solid state lighting device

• US 7,834,372 B2
• Filed: 12/16/2008
• Issued: 11/16/2010
• Est. Priority Date: 12/16/2008
• Status: Expired due to Fees

• Current Assignee: LEDnovation, Inc.
• Original Assignee: LEDnovation, Inc.
• Inventors: Morejon, Israel, Zhai, Jinhui, Bui, Thong
• Primary Examiner(s): Ngo; Ngan
• Assistant Examiner(s): LIU, BENJAMIN T
• Application Number:
  US12/336,107
• Publication Number:
  US 20100148191A1
• Time in Patent Office: 700 Days
• Field of Search: 257/79, 257/98, 257/88, 257/95, 257/99, 257/100, 257/E33.055, 257/E33.058, 257/E33.072
• US Class Current: 257/98
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 9/02 for simulating daylight F21V9/04, F21V9/06 take precedence
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A high luminous flux warm white solid state lighting device with a high color rendering is disclosed. The device comprising two groups of semiconductor light emitting components to emit and excite four narrow-band spectrums of lights at high luminous efficacy, wherein the semiconductor light emitting components are directly mounted on a thermal effective dissipation member; a mixing cavity for blending the multi-spectrum of lights; a back-transferred light recycling member deposited on top of an LED driver and around the semiconductor light emitters; and a diffusive member to diffuse the mixture of output light from the solid state lighting device. The solid state lighting device produces a warm white light with luminous efficacy at least 80 lumens per watt and a color rendering index at least 85 for any lighting application.

Claims

1. A solid state lighting device comprising:

a first group of semiconductor light emitting components emitting a first spectrum of primary light, said first group of semiconductor light emitting components emitting a near-UV primary light having a peak wavelength range from about 380 nm to 420 nm;

a first wavelength down-conversion layer on top of said first group of semiconductor light emitting components exciting a second spectrum of yellow light having a narrow bandwidth, said first wavelength down-conversion layer comprising a mixture of blue quantum dots, and yellow quantum dots, said first wavelength down-conversion layer exciting a blue spectrum of light having a peak wavelength from about 440 nm to 465 nm, and a yellow spectrum of light having a peak wavelength from about 550 nm to 575 nm and a narrow bandwidth with full width at half maximum less than 75 nm;

a second wavelength down-conversion layer on top of said first wavelength down-conversion layer exciting a third spectrum of light having a peak wavelength between said first spectrum of primary light and said second spectrum of yellow light;

a second group of semiconductor light emitting components emitting a fourth spectrum of light having a peak wavelength longer than said first spectrum of primary light and said second spectrum of yellow light;

a color mixing cavity having a diffusive output window mixing said first spectrum of primary light, said second spectrum of yellow light, said third spectrum of light and said fourth spectrum of light;

a light recycling reflector member around an interior wall of said solid state lighting device, said light recycling reflector member surrounding said first group of semiconductor light emitting components and said second group of semiconductor light emitting components; and

a power line electrically connected to said first group of semiconductor light emitting components and said second group of semiconductor light emitting components.

2. A solid state lighting device comprising:

a first group of semiconductor light emitting components emitting a first spectrum of primary light;

a first wavelength down-conversion layer on top of said first group of semiconductor light emitting components exciting a second spectrum of yellow light having a narrow bandwidth;

a second group of semiconductor light emitting components, said second group of semiconductor light emitting components comprising a third spectrum of green semiconductor light emitters and a fourth spectrum of reddish orange semiconductor light emitters, said green semiconductor light emitters and said reddish orange semiconductor light emitters being packaged on a single substrate chip;

a color mixing cavity having a diffusive output window mixing said first spectrum of primary light, said second spectrum of yellow light, said third spectrum of light and said fourth spectrum of light;

a light recycling reflector member around an interior wall of said solid state lighting device, said light recycling reflector member surrounding said first group of semiconductor light emitting components and said second group of semiconductor light emitting components; and

a power line electrically connected to said first group of semiconductor light emitting components and said second group of semiconductor light emitting components.